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LM2673S-3.3 from NS,National Semiconductor

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LM2673S-3.3

Manufacturer: NS

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit

Partnumber Manufacturer Quantity Availability
LM2673S-3.3,LM2673S33 NS 16696 In Stock

Description and Introduction

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit The LM2673S-3.3 is a step-down voltage regulator manufactured by National Semiconductor (NS). Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Output Voltage:** 3.3V (fixed)  
- **Input Voltage Range:** 8V to 40V  
- **Output Current:** Up to 3A  
- **Switching Frequency:** 260 kHz  
- **Efficiency:** Up to 92%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** TO-263 (D2PAK)  

### **Descriptions:**  
The LM2673S-3.3 is a monolithic integrated circuit that provides all necessary functions for a step-down (buck) switching regulator. It is designed for high efficiency and simplicity, requiring minimal external components.  

### **Features:**  
- **Simple and Easy-to-Use:** Requires only 6 external components.  
- **Internal Soft-Start:** Reduces inrush current.  
- **Thermal Shutdown Protection:** Prevents overheating.  
- **Current Limiting Protection:** Safeguards against overloads.  
- **Low Power Standby Mode:** Enhances efficiency at light loads.  
- **High Efficiency:** Minimizes power dissipation.  

This regulator is commonly used in power supply applications requiring stable 3.3V output from higher input voltages.

Application Scenarios & Design Considerations

SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit

Alternative Part Number

  • TPS54331D --: 3A step-down converter with adjustable output, similar input range and switching frequency; can be set to 3.3V with external resistors and is a common drop-in style replacement.
  • LT1933ES6 --: Compact 1.2A step-down regulator with wide input range; suitable for lower-current 3.3V rails and easy to design in as an alternative topology.
  • MC34063ADR2G --: Versatile general-purpose switching regulator that can be configured as a 3.3V step-down converter; widely available and cost-effective for less demanding loads.

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